Water Pump Impeller Kit with Housing – Fits OMC Cobra Stern Drives (Replaces 984461, 983895, 984744)

Water Pump Impeller Kit with Housing – Fits OMC Cobra Stern Drives (Replaces 984461, 983895, 984744)

This comprehensive water pump impeller repair kit is designed for OMC Cobra stern drive units on engines ranging from 2.3L to 7.5L (1986–1993). The kit includes a complete water pump assembly with a durable aluminum alloy housing, providing a direct-fit replacement for original OMC components.

This kit is a direct replacement for OMC part numbers 984461 and 984744, as well as Sierra 18-3348, Sierra 18-3212-1, and GLM 12092.

• Includes a complete water pump assembly with housing for a full repair.
• Engineered with a stainless steel wear plate and liner for enhanced durability and corrosion resistance.
• Designed for external, stern drive mounted installations.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Housing (984744)
• 1 x Impeller (777128/983895)
• 1 x Stainless steel liner (911844/764197)
• 1 x Stainless steel wear plate (911703)
• 1 x Gasket (911702)
• 1 x O-ring seal (911704)

Installation Guide

1. Safety First: Disconnect the boat's battery before starting any work.
2. Access the Pump: Remove the stern drive's lower unit to access the water pump assembly.
3. Remove Old Pump: Carefully unbolt and detach the old water pump housing from the lower unit. Note the orientation of all parts.
4. Clean Surface: Thoroughly clean the mounting surface on the lower unit, removing any old gasket material or sealant residue.
5. Install New Components: Place the new gasket and stainless steel wear plate onto the lower unit.
6. Insert Impeller: Apply a small amount of lubricant to the new impeller and insert it into the new housing, turning the driveshaft clockwise to bend the vanes correctly.
7. Mount New Housing: Secure the new housing assembly over the impeller and bolt it down to the manufacturer's torque specifications.
8. Reassemble: Reinstall the lower unit onto the stern drive.
9. Test: Reconnect the battery. Start the engine in the water or with a proper flush attachment and check for strong water flow from the tell-tale outlet and for any leaks around the housing.

Troubleshooting & FAQ

Q: How do I know if this kit will fit my OMC Cobra engine?

A: Please check your engine model and year against the detailed compatibility chart above. This kit is specifically designed for OMC Cobra stern drives from 2.3L to 7.5L (model years 1986-1993) and directly replaces OEM part numbers 984461 and 984744.

Q: What are the symptoms of a failing water pump impeller?

A: The most common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or a high temperature alarm sounding. Upon inspection, the old impeller may have cracked, brittle, or broken vanes.

Q: How often should I replace the water pump impeller?

A: As a crucial part of preventative maintenance, we recommend inspecting the impeller annually and replacing it every 1-2 seasons or 100-200 hours of operation. Replacement frequency depends on usage and water conditions (saltwater, sandy, or silty water can accelerate wear).

Q: Is this an OEM part?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.